.htaccess redirect if file doesn't exist

Question

So here\'s what I\'m trying to do. I have a simple framework and I am using mod rewrite to rewrite the urls so that they point to the correct files. I have a process folder

Answer 1

This rule alone should do it:

RewriteCond %{DOCUMENT_ROOT}web/$0 !-f
RewriteRule ^process/[^/]+$ web/process/default.php [L]

If the requested path cannot be mapped to an existing file, it should be rewritten to the default file.